games/pioneer: Update to 20190203

• While here move option descriptions before options helpers as recommended by the Porter's Handbook section 15.10.

Changes: https://github.com/pioneerspacesim/pioneer/compare/20180203...20190203
Changes: https://github.com/pioneerspacesim/pioneer/blob/20190203/Changelog.txt
PR: 235515
Submitted by: lightside@gmx.com (maintainer)